EP1575338A1 - Dispositif d'éclairage à temperature de couleur réglable et procédé pour modifier l'émission de température de la lumière - Google Patents
Dispositif d'éclairage à temperature de couleur réglable et procédé pour modifier l'émission de température de la lumière Download PDFInfo
- Publication number
- EP1575338A1 EP1575338A1 EP04425158A EP04425158A EP1575338A1 EP 1575338 A1 EP1575338 A1 EP 1575338A1 EP 04425158 A EP04425158 A EP 04425158A EP 04425158 A EP04425158 A EP 04425158A EP 1575338 A1 EP1575338 A1 EP 1575338A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- luminous sources
- color temperature
- light
- temperature
- leds
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
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Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/20—Controlling the colour of the light
Definitions
- the present invention relates to a variable color temperature lighting device and a method for varying the light emission temperature of a lighting device.
- Various types of lighting device are currently distributed on the market, such as for example neon bulbs or tubes, each one able to emit white light with a preset color temperature (shade).
- a same product for example a neon tube with given electrical and dimensional characteristics, is therefore proposed in different versions, each one with its own color temperature in order to satisfy the different lighting requirements.
- the bulbs or the tubes currently distributed cover a temperature range that varies approximately between 2500 and 7000 K (degrees Kelvin) and are thus also distinguished as “warm light”, “cold light” lighting devices, etc., and this is to allow the most suitable choice to each particular application.
- warm light for example close to sunlight
- cold light although worsening the appearance, will make it possible to detect more easily any details and defects in the make up.
- the need is therefore felt for providing a lighting device that allows to adapt the color temperature of the emitted light.
- the object of the present invention is to propose a novel lighting device that allows a user to vary the color temperature of the white light at will according to the particular requirements that may arise in an installation site.
- Another object of the present invention is that of providing a device that allows to vary in a particularly simple way the color temperature of the white light.
- variable color temperature lighting device characterised by comprising a plurality of luminous sources each one having a different color temperature to the others and means for controlling in an independent way the emission power of each of the luminous sources.
- the luminous sources preferably include at least three LEDs, of which at least one consists of a white light LED. More preferably, all the luminous sources consist of white light LEDS with different color temperatures.
- the device according to the invention preferably includes optical means of mixing the beams of light emitted by the luminous sources.
- the optical means include at least one lens for each of the luminous sources.
- the luminous sources and the optical mixing means are enclosed inside a single enclosure to form an interchangeable module.
- the model as a whole can be advantageously provided with a standard type connection element to allow the installation of the device according to the invention with the systems or attachments used on the market.
- the means for controlling in an independent way the emission power of each of the luminous sources are preferably commanded from a single command point.
- control means suitable to the present invention preferably allow to change the color temperature of the light in a continuous, automatic way or in any case programmable with dedicated software, acting preferably through a single control member, such as a button or similar.
- a method for varying the color temperature of the light emitted by a lighting device, characterised in that it provides the independent control of the intensity power of a plurality of luminous sources each one having a different color temperature to the others.
- a lighting device is depicted in Figure 1 and comprises a control unit 10 that receives electrical energy through a power cable 11.
- the power supply may be provided in alternating current, withdrawn for example from the mains and optionally reduced upstream of the device 10, or it may be provided in direct current, using for example a battery or means for rectifying (and optionally reducing) the mains voltage.
- the unit 10 is arranged and/or programmed to control in an independent way the emission power of each of the luminous sources connected thereto, preferably by acting through a single command point, such as, for example, a button 13 represented in Figure 1.
- At least three LEDs 20a, 20b, 20c are preferably used, mounted on a connection plate 21 to which the conductors 12 coming out of the unit 10 are joined.
- the LEDs 20a, 20b and 20c are preferably LEDs able to emit white light with different color temperatures, and are selected with color temperatures such as to cover the whole range of temperatures desired.
- the LED 20a is selected with a color temperature equal to the maximum value of the range
- the LED 20b is selected with a color temperature equal to the minimum value of the range
- the LED 20c is selected with a color temperature intermediate to the two extremes.
- LEDs of the Lambertian type identified by the trade name Luxeon Warm White and distributed by Lumileds Lighting were used.
- a first of the LEDs had a color temperature equal to 8000 K
- a second LED had a color temperature equal to 2850 K
- a third LED had a color temperature equal to 4000 K. Therefore by varying the luminous intensity of each of the LEDs in an independent way it was possible to make a lighting device able to emit light with color temperatures from 2850 K to 8000 K, thus substantially covering all the color temperatures supplied by bulbs and/or tubes currently on the market.
- the device advantageously comprises optical means for mixing the beams of light emitted by the luminous sources.
- optical means for each of the LEDs 20a, 20b, 20c a respective lens 30a, 30b, 30c is provided.
- the lenses 30a-30c of which the upper caps alone are represented for clarity in Figure 1, arranged on a support 31, allow to generate a single luminous beam with the desired temperature characteristics.
- a white light can be obtained in which the emission of one or more of the LEDs present in the device prevails, thereby obtaining a light having a color temperature prevalently determined by the LED that is commanded with emission intensity higher than the others.
- Figure 2 schematically represents a possible embodiment of an interchangeable module 40 suitable to be used in a device according to the present invention.
- the module 40 comprises an enclosure 41 housing the LEDs 20a, 20b, 20c therein, mounted on the connection plate 21, as are the lenses 30a, 30b, 30c with the relative support 31.
- Lenses of the Lambertian type FHS series with luminous beam angles of approximately 40-45° ("wide beam” type version) distributed by the Fraen Corporation were used in the practical embodiment of the device.
- the module 40 advantageously comprises a standard type connection element 42, for example an MR11 or MR16 type connection element in order to allow the installation of the module 40 with attachments particularly widespread on the market.
- a standard type connection element 42 for example an MR11 or MR16 type connection element
- control unit 10 with microprocessor programmed to make available functions substantially similar to those described for patent application no. MI2003-A001987 filed in the name of the same Applicant.
- a pressure exerted for a short time on the button 13 may allow the switching on and off of the luminous sources, with the possibility of storing the setting of the color temperature emitted at the time of switching off.
- connection element 42 may be of a different type to those described and/or represented.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04425158A EP1575338A1 (fr) | 2004-03-09 | 2004-03-09 | Dispositif d'éclairage à temperature de couleur réglable et procédé pour modifier l'émission de température de la lumière |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04425158A EP1575338A1 (fr) | 2004-03-09 | 2004-03-09 | Dispositif d'éclairage à temperature de couleur réglable et procédé pour modifier l'émission de température de la lumière |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1575338A1 true EP1575338A1 (fr) | 2005-09-14 |
Family
ID=34814463
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04425158A Withdrawn EP1575338A1 (fr) | 2004-03-09 | 2004-03-09 | Dispositif d'éclairage à temperature de couleur réglable et procédé pour modifier l'émission de température de la lumière |
Country Status (1)
Country | Link |
---|---|
EP (1) | EP1575338A1 (fr) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007052854A1 (de) | 2007-11-06 | 2009-05-07 | Münchner Hybrid Systemtechnik GmbH | Verfahren und Vorrichtung zur Steuerung der Lichtabgabe einer LED-Leuchte |
GB2456123A (en) * | 2007-02-12 | 2009-07-08 | Ecoled Lighting Ltd | Light emitting diode lamp |
ITPN20100065A1 (it) * | 2010-11-19 | 2012-05-20 | Rino Snaidero Scient Foundation | Sistema d illuminazione per piani di lavoro quali piani di cucine |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3917101A1 (de) * | 1989-05-26 | 1990-11-29 | Wolfgang Prof Dr Ing Rienecker | Beleuchtungsvorrichtung |
US20020048177A1 (en) * | 2000-09-06 | 2002-04-25 | Rahm Peter R. | Apparatus and method for adjusting the color temperature of white semiconductor light emitters |
US20030107887A1 (en) * | 2000-06-27 | 2003-06-12 | Eberl Heinrich Alexander | Illuminating device with light emitting diodes (led), method of illumination and method for image recording with said led illumination device |
-
2004
- 2004-03-09 EP EP04425158A patent/EP1575338A1/fr not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3917101A1 (de) * | 1989-05-26 | 1990-11-29 | Wolfgang Prof Dr Ing Rienecker | Beleuchtungsvorrichtung |
US20030107887A1 (en) * | 2000-06-27 | 2003-06-12 | Eberl Heinrich Alexander | Illuminating device with light emitting diodes (led), method of illumination and method for image recording with said led illumination device |
US20020048177A1 (en) * | 2000-09-06 | 2002-04-25 | Rahm Peter R. | Apparatus and method for adjusting the color temperature of white semiconductor light emitters |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2456123A (en) * | 2007-02-12 | 2009-07-08 | Ecoled Lighting Ltd | Light emitting diode lamp |
GB2456123B (en) * | 2007-02-12 | 2012-03-07 | Ecoled Lighting Ltd | Light emitting diode lamp |
DE102007052854A1 (de) | 2007-11-06 | 2009-05-07 | Münchner Hybrid Systemtechnik GmbH | Verfahren und Vorrichtung zur Steuerung der Lichtabgabe einer LED-Leuchte |
ITPN20100065A1 (it) * | 2010-11-19 | 2012-05-20 | Rino Snaidero Scient Foundation | Sistema d illuminazione per piani di lavoro quali piani di cucine |
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